For a spherical elastic inclusion, the paper gives explicit finite-frequency eigenvalues and eigenfunctions of the Neumann-Poincaré operator and constructs core-shell metamaterials whose anomalous resonances cloak sources inside a critical radius.
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Spectral properties of Neumann-Poincare operator and anomalous localized resonance in elasticity beyond quasi-static limit
For a spherical elastic inclusion, the paper gives explicit finite-frequency eigenvalues and eigenfunctions of the Neumann-Poincaré operator and constructs core-shell metamaterials whose anomalous resonances cloak sources inside a critical radius.